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Blown Gasket... Turbo Suggestions

noise

By noise,
in Forced Induction Performance

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noise Mentor

noise

Posted
Posted

Yo,

Last week end a nut came off where my turbo bolts to the manifold and I ended up blowing the gasket. I have since put a new bolt in to stop exhaust leak and will be replacing the gasket at a later stage.

I was thinking that since I will be pulling the turbo off that I might as well replace it with something a bit bigger that I can just bolt in its place.

Anyone recommend a bolt on turbo that is bigger but won’t require me to change other parts?

Will I have any issues with the ecu if I run a bigger turbo at say like 15-20psi?

Secondly how much can I get for a stock r34 GTT turbo s1 ?

Cheers

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The Mafia Grand Master

The Mafia

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Posted (edited)

nothing bigger will ever just "bolt up"

bigger comp covers will hit the ex manifold, thus needing spacers to move the turbo away from the manifold. You can find stuff that bolts onto the factor dump... but the factory dump is shit... and would be even shittier with a bigger turbo. But, I had an aftermarket dump on my car to suit the factory turbo. When I got the bigger turbo, I got a VG30 ass end which kind of does "bolt straight up"

But you also need oil and water lines etc..

as for the 15psi - 20psi...

No offence, but from what I can see you haven't owned a skyline for long...Or know little about the RB25

Here are 2 reasons why you can't boost 15psi - 20psi on a skyline

Reason 1: Boost cut. As soon as the factory ECU detects 12psi or more, bam, expect a 30rwkw to 60rwkw loss, due to rich and retard. The ecu does this to prevent reason 2.

Reason 2: At about 16psi or more on an unopened motor, you are playing with fire. You will either blow your head gasket or bend your rods. Bending rods can be catastrophic (spend 5k rebuilding your motor)

So if I were you, I'd either

a) Get a bigger turbo, and all of the support systems (fuel pump, injectors, aftermarket ECU) and do it properly, and run it at 1 bar or less which is expensive or;

b.) Change the gasket, put the old turo back on, and get a new ecu and have it tuned for 200rwkw.

Expensive way, or cheap way.

I have done both....lol

Edited by The Mafia
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noise Mentor

noise

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Posted (edited)

Thanks for the info.

I know it was a big ask just being able to wack on a bigger turbo, but i thought i would see if i could anyway.

The mods on the car at the moment are:

HKS double adjustable suspension

K&N pod with a CAI box with stock snorkle

3 inch dump

Catco hi-flow cat

3inch cat back with 4 inch canon

Arc sway bars under the car

Arc strut brace in engine bay

I have a manual boost controller but currently do not use it as I was having misfire and cut out problems at higher boost.

so with the stock turbo back on and a PowerFC and manual boost controller I can run say 10psi and will notice a improvement in acceleration and power?

cheers

Edited by tdawg
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The Mafia Grand Master

The Mafia

Posted
Posted

not really, if you want a cheap easy way, get a Front mount fitted, and powerfc, and a tune.

Will cost about $2.4k all up

will get you about 200rwkw and a lot more torque, as apposed to 150rwkw

Your stock intercool will only handle 10psi, and its not muc different power to what you will have stock

I've done all this...and I love my car :P

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